Unexpected Friends

Dumbledore announces there will be House Unity Day. What happens if he puts certain people together in a group? And what happens if the war against Voldemort is sooner than expected? What happens when Draco and his friends have to carry out there own sinnister plans? Will everyone accept the forbidden couples? Dark secrets/pasts Draco/Hermione, Blaise/Ginny, Harry/OC, and Ron/Pansy